Complete Guide to Pull Stud Specifications: Differences and Selection Guide between MAS, BT, DIN, an

Complete Guide to Pull Stud Specifications: Differences and Selection Guide between MAS, BT, DIN, and ANSI Standards

introduction

The pull stud (also known as a tie rod bolt or pull head) is a crucial connecting component between the CNC tool holder and the machine tool spindle pulley. Although small, it bears the heavy responsibility of firmly securing the tool holder to the spindle. Incorrect pull stud selection can lead to tool drop, machining accidents, or even spindle damage. This article will guide you through a thorough understanding of pull stud specifications and selection methods.

I. Functions and Importance of Pull Studs

The pull stud is installed in a threaded hole at the tail of the tool holder. When the tool holder is inserted into the spindle, the pull jaws inside the spindle grab the head of the pull stud, and the tool holder is pulled tight into the spindle taper hole by hydraulic or spring force. The head shape, angle, and thread specifications of the pull stud must be perfectly matched with the pull jaw mechanism of the machine tool spindle.

Consequences of choosing the wrong pull stud: insufficient tension, mismatched head angles, incorrect threads.